# REQUIRE : on Ruby
require 'active_support/testing/time_helpers'
# => true
require 'active_support/core_ext'
# => true
include ActiveSupport::Testing::TimeHelpers
# => Object
# Travel to JST beggining of Year
travel_to Time.use_zone('Tokyo') { Time.parse('2020-01-01 00:00') }
# => nil
# JST
Time.use_zone('Tokyo') { Time.now }
# => 2020-01-01 00:00:00 +0900
Time.use_zone('Tokyo') { Time.current }
# => Wed, 01 Jan 2020 00:00:00 JST +09:00
Time.use_zone('Tokyo') { Time.zone.now }
# => Wed, 01 Jan 2020 00:00:00 JST +09:00
Time.use_zone('Tokyo') { Date.current }
# => Wed, 01 Jan 2020
# UTC
Time.use_zone('UTC') { Time.now }
# => 2020-01-01 00:00:00 +0900
Time.use_zone('UTC') { Time.current }
# => Tue, 31 Dec 2019 15:00:00 UTC +00:00
Time.use_zone('UTC') { Time.zone.now }
# => Tue, 31 Dec 2019 15:00:00 UTC +00:00
Time.use_zone('UTC') { Date.current }
# => Tue, 31 Dec 2019
# Unix Timestamp
# are All same at any Timezone
Time.use_zone('Tokyo') { Time.now.to_i }
# => 1577804400
Time.use_zone('Tokyo') { Time.zone.now.to_i }
# => 1577804400
Time.use_zone('UTC') { Time.now.to_i }
# => 1577804400
Time.use_zone('UTC') { Time.zone.now.to_i }
# => 1577804400
Time.now.to_i
# => 1577804400
Time.current.to_i
# => 1577804400
# Date.today
# Not considered Timezone with Time.zone setting
# its Ruby method refers TZ env
Time.use_zone('Tokyo') { Date.today }
# => Wed, 01 Jan 2020
Time.use_zone('UTC') { Date.today }
# => Wed, 01 Jan 2020
Original by Github issue
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